package com.dailywork.basepro.thread.concurrent.concurrent;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ForkJoinPool;

/**
 * @author Benjamin Winterberg
 */
public class ConcurrentHashMap1 {

    public static void main(String[] args) {
        System.out.println("Parallelism: " + ForkJoinPool.getCommonPoolParallelism());

        testForEach();
        testSearch();
        testReduce();
    }

    private static void testReduce() {
        ConcurrentHashMap<String, String> map = new ConcurrentHashMap<>();
        map.putIfAbsent("foo", "bar");
        map.putIfAbsent("han", "solo");
        map.putIfAbsent("r2", "d2");
        map.putIfAbsent("c3", "p0");

        String reduced = map.reduce(1, (key, value) -> key + "=" + value, (s1, s2) -> s1 + ", " + s2);

        System.out.println(reduced);
    }

    private static void testSearch() {
        ConcurrentHashMap<String, String> map = new ConcurrentHashMap<>();
        map.putIfAbsent("foo", "bar");
        map.putIfAbsent("han", "solo");
        map.putIfAbsent("r2", "d2");
        map.putIfAbsent("c3", "p0");

        System.out.println("\nsearch()\n");

        String result1 =
                map.search(
                        1,
                        (key, value) -> {
                            System.out.println(Thread.currentThread().getName());
                            if (key.equals("foo") && value.equals("bar")) {
                                return "foobar";
                            }
                            return null;
                        });

        System.out.println(result1);

        System.out.println("\nsearchValues()\n");

        String result2 =
                map.searchValues(
                        1,
                        value -> {
                            System.out.println(Thread.currentThread().getName());
                            if (value.length() > 3) {
                                return value;
                            }
                            return null;
                        });

        System.out.println(result2);
    }

    private static void testForEach() {
        ConcurrentHashMap<String, String> map = new ConcurrentHashMap<>();
        map.putIfAbsent("foo", "bar");
        map.putIfAbsent("han", "solo");
        map.putIfAbsent("r2", "d2");
        map.putIfAbsent("c3", "p0");

        map.forEach(
                1,
                (key, value) ->
                        System.out.printf(
                                "key: %s; value: %s; thread: %s\n", key, value, Thread.currentThread().getName()));
        //        map.forEach(5, (key, value) -> System.out.printf("key: %s; value: %s; thread: %s\n",
        // key, value, Thread.currentThread().getName()));

        System.out.println(map.mappingCount());
    }
}
